Calvin Threshold Days by Year (USC00341391)

5 fixed thresholds counted per year at Calvin (USC00341391): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Calvin Thresholds

Calvin: days with 10 mm (0.39 in) or more of precipitation in 105 years, most in 1923 with 49.
Calvin: days with 25 mm (0.98 in) or more of precipitation in 105 years, most in 1945 with 27.
Calvin: days with 50 mm (1.97 in) or more of precipitation in 101 years, most in 1908 with 9.
Calvin: days with 100 mm (3.94 in) or more of precipitation in 34 years, most in 1906 with 2.
5 fixed thresholds have at least one qualifying day at Calvin.

Days with 10 mm (0.39 in) or more of precipitation

105 years with a qualifying day

Days per year at Calvin with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 49 in 1923.

Days with 10 mm (0.39 in) or more of precipitation per year at Calvin
Year	Days	Decade average
1905	43	34
1906	30	34
1907	27	34
1908	45	34
1909	25	34
1910	23	30.9
1911	28	30.9
1912	30	30.9
1913	27	30.9
1914	31	30.9
1915	39	30.9
1916	28	30.9
1917	29	30.9
1918	34	30.9
1919	40	30.9
1921	26	35.1
1922	32	35.1
1923	49	35.1
1924	26	35.1
1925	24	35.1
1926	37	35.1
1927	46	35.1
1928	40	35.1
1929	36	35.1
1930	36	30.2
1931	29	30.2
1932	34	30.2
1933	34	30.2
1934	23	30.2
1935	40	30.2
1936	22	30.2
1937	29	30.2
1938	29	30.2
1939	26	30.2
1940	33	33.9
1941	33	33.9
1942	31	33.9
1943	27	33.9
1944	32	33.9
1945	48	33.9
1946	37	33.9
1948	20	33.9
1949	44	33.9
1950	35	31
1951	30	31
1952	28	31
1953	33	31
1954	25	31
1955	28	31
1956	22	31
1957	42	31
1958	36	31
1959	31	31
1960	37	29.1
1961	34	29.1
1962	27	29.1
1963	19	29.1
1964	27	29.1
1965	25	29.1
1966	24	29.1
1967	25	29.1
1968	43	29.1
1969	30	29.1
1970	24	31.4
1971	39	31.4
1972	26	31.4
1973	48	31.4
1974	28	31.4
1975	42	31.4
1976	27	31.4
1977	23	31.4
1978	22	31.4
1979	35	31.4
1980	24	33.2
1981	36	33.2
1982	35	33.2
1983	36	33.2
1984	36	33.2
1985	36	33.2
1986	29	33.2
1987	39	33.2
1988	28	33.2
1989	33	33.2
1990	42	31.7
1991	35	31.7
1992	46	31.7
1993	31	31.7
1995	17	31.7
1996	34	31.7
1997	30	31.7
1998	23	31.7
1999	27	31.7
2000	33	30.3
2001	27	30.3
2002	39	30.3
2003	20	30.3
2004	39	30.3
2005	19	30.3
2006	31	30.3
2008	28	30.3
2009	37	30.3
2010	36	33.3
2011	27	33.3
2012	24	33.3
2013	46	33.3

For each year, a bar from the first to the last day at Calvin meeting 10 mm (0.39 in).

First to last qualifying date each year at Calvin
Year	First date	Last date
1905	1905-01-09	1905-12-20
1906	1906-01-03	1906-12-15
1907	1907-01-03	1907-12-22
1908	1908-01-04	1908-11-29
1909	1909-02-14	1909-12-05
1910	1910-01-05	1910-12-29
1911	1911-02-11	1911-12-20
1912	1912-02-21	1912-12-23
1913	1913-01-11	1913-12-13
1914	1914-01-29	1914-12-29
1915	1915-02-13	1915-12-31
1916	1916-01-12	1916-11-22
1917	1917-01-05	1917-11-28
1918	1918-03-03	1918-12-24
1919	1919-01-01	1919-11-29
1921	1921-01-24	1921-12-01
1922	1922-01-10	1922-12-01
1923	1923-01-31	1923-12-22
1924	1924-01-24	1924-12-18
1925	1925-01-16	1925-11-07
1926	1926-01-02	1926-12-21
1927	1927-01-12	1927-12-27
1928	1928-01-18	1928-12-18
1929	1929-01-05	1929-12-11
1930	1930-01-08	1930-12-05
1931	1931-02-08	1931-12-16
1932	1932-01-04	1932-12-24
1933	1933-01-18	1933-11-21
1934	1934-01-03	1934-12-19
1935	1935-01-08	1935-12-06
1936	1936-02-26	1936-12-27
1937	1937-01-08	1937-12-17
1938	1938-01-22	1938-11-07
1939	1939-01-09	1939-12-23
1940	1940-02-03	1940-12-26
1941	1941-01-01	1941-12-11
1942	1942-02-09	1942-12-27
1943	1943-02-03	1943-12-28
1944	1944-01-08	1944-12-28
1945	1945-01-19	1945-11-10
1946	1946-01-05	1946-12-12
1948	1948-01-01	1948-12-15
1949	1949-01-12	1949-12-26
1950	1950-01-02	1950-11-04
1951	1951-01-03	1951-11-02
1952	1952-02-02	1952-12-19
1953	1953-02-11	1953-12-03
1954	1954-02-20	1954-12-29
1955	1955-01-10	1955-12-01
1956	1956-01-22	1956-12-20
1957	1957-01-22	1957-12-25
1958	1958-01-20	1958-11-28
1959	1959-02-28	1959-12-27
1960	1960-01-06	1960-12-31
1961	1961-02-07	1961-12-16
1962	1962-03-20	1962-12-20
1963	1963-03-09	1963-12-11
1964	1964-01-31	1964-12-10
1965	1965-01-02	1965-11-06
1966	1966-01-02	1966-12-28
1967	1967-01-26	1967-12-21
1968	1968-01-18	1968-12-28
1969	1969-01-29	1969-12-29
1970	1970-02-25	1970-11-14
1971	1971-01-04	1971-12-15
1972	1972-02-12	1972-12-12
1973	1973-01-03	1973-12-04
1974	1974-02-21	1974-12-31
1975	1975-01-03	1975-12-25
1976	1976-02-21	1976-12-06
1977	1977-02-12	1977-12-01
1978	1978-01-12	1978-11-26
1979	1979-01-19	1979-12-24
1980	1980-01-20	1980-12-08
1981	1981-02-01	1981-11-30
1982	1982-01-22	1982-12-28
1983	1983-01-22	1983-12-02
1984	1984-01-10	1984-12-21
1985	1985-01-01	1985-12-11
1986	1986-02-08	1986-11-26
1987	1987-01-09	1987-12-27
1988	1988-01-17	1988-12-28
1989	1989-01-26	1989-12-08
1990	1990-01-03	1990-12-29
1991	1991-01-05	1991-12-23
1992	1992-01-14	1992-12-15
1993	1993-01-09	1993-12-04
1995	1995-01-20	1995-12-19
1996	1996-01-17	1996-11-17
1997	1997-02-20	1997-12-24
1998	1998-01-04	1998-11-30
1999	1999-01-23	1999-11-23
2000	2000-01-27	2000-12-27
2001	2001-01-28	2001-12-16
2002	2002-01-25	2002-12-29
2003	2003-02-15	2003-11-18
2004	2004-01-15	2004-12-07
2005	2005-01-04	2005-10-31
2006	2006-01-28	2006-12-31
2008	2008-02-15	2008-12-22
2009	2009-02-11	2009-12-25
2010	2010-01-03	2010-12-24
2011	2011-02-01	2011-12-20
2012	2012-01-10	2012-12-31
2013	2013-01-01	2013-12-21

Every Fixed Threshold

Fixed thresholds at Calvin
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	105	49	1923	46
25 mm (0.98 in): Days with 25 mm or more rain	105	27	1945	17
50 mm (1.97 in): Days with 50 mm or more rain	101	9	1908	6
100 mm (3.94 in): Days with 100 mm or more rain	34	2	1906	1
10 cm (3.9 in): Days with 10 cm or more snowfall	15	2	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

Download the Data

Data for Calvin threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Calvin Threshold Days by Year (USC00341391)

Key Facts for Calvin Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

Related